Re: [PATCH v4 09/10] kunit: Use string_stream for test log

From: David Gow
Date: Tue Aug 15 2023 - 05:19:25 EST

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In reply to: Richard Fitzgerald: "[PATCH v4 09/10] kunit: Use string_stream for test log"
Next in thread: Richard Fitzgerald: "[PATCH v4 10/10] kunit: string-stream: Test performance of string_stream"
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On Mon, 14 Aug 2023 at 21:23, Richard Fitzgerald
<rf@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Replace the fixed-size log buffer with a string_stream so that the
> log can grow as lines are added.
>
> The existing kunit log tests have been updated for using a
> string_stream as the log. As they now depend on string_stream
> functions they cannot build when kunit-test is a module. They have
> been moved to a separate source file to be built only if kunit-test
> is built-in.
>
> Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
> ---

Yay! This is much nicer.

A part of me wonders if it makes sense to do something to allow the
tests to continue to work as a module (either exporting the needed
string stream functions, or moving the tests into the main KUnit
module, and just exporting the suite definition to a stub module).
Probably not worth it, though...

Reviewed-by: David Gow <davidgow@xxxxxxxxxx>

Cheers,
-- David

> include/kunit/test.h | 14 ++++----
> lib/kunit/Makefile | 5 +--
> lib/kunit/debugfs.c | 36 +++++++++++++--------
> lib/kunit/kunit-test.c | 52 +-----------------------------
> lib/kunit/log-test.c | 72 ++++++++++++++++++++++++++++++++++++++++++
> lib/kunit/test.c | 44 +++-----------------------
> 6 files changed, 110 insertions(+), 113 deletions(-)
> create mode 100644 lib/kunit/log-test.c
>
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index d33114097d0d..b915a0fe93c0 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -32,9 +32,7 @@
> DECLARE_STATIC_KEY_FALSE(kunit_running);
>
> struct kunit;
> -
> -/* Size of log associated with test. */
> -#define KUNIT_LOG_SIZE 2048
> +struct string_stream;
>
> /* Maximum size of parameter description string. */
> #define KUNIT_PARAM_DESC_SIZE 128
> @@ -132,7 +130,7 @@ struct kunit_case {
> /* private: internal use only. */
> enum kunit_status status;
> char *module_name;
> - char *log;
> + struct string_stream *log;
> };
>
> static inline char *kunit_status_to_ok_not_ok(enum kunit_status status)
> @@ -252,7 +250,7 @@ struct kunit_suite {
> /* private: internal use only */
> char status_comment[KUNIT_STATUS_COMMENT_SIZE];
> struct dentry *debugfs;
> - char *log;
> + struct string_stream *log;
> int suite_init_err;
> };
>
> @@ -278,7 +276,7 @@ struct kunit {
>
> /* private: internal use only. */
> const char *name; /* Read only after initialization! */
> - char *log; /* Points at case log after initialization */
> + struct string_stream *log; /* Points at case log after initialization */
> struct kunit_try_catch try_catch;
> /* param_value is the current parameter value for a test case. */
> const void *param_value;
> @@ -314,7 +312,7 @@ const char *kunit_filter_glob(void);
> char *kunit_filter(void);
> char *kunit_filter_action(void);
>
> -void kunit_init_test(struct kunit *test, const char *name, char *log);
> +void kunit_init_test(struct kunit *test, const char *name, struct string_stream *log);
>
> int kunit_run_tests(struct kunit_suite *suite);
>
> @@ -472,7 +470,7 @@ static inline void *kunit_kcalloc(struct kunit *test, size_t n, size_t size, gfp
>
> void kunit_cleanup(struct kunit *test);
>
> -void __printf(2, 3) kunit_log_append(char *log, const char *fmt, ...);
> +void __printf(2, 3) kunit_log_append(struct string_stream *log, const char *fmt, ...);
>
> /**
> * kunit_mark_skipped() - Marks @test_or_suite as skipped
> diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile
> index 46f75f23dfe4..65735c2e1d14 100644
> --- a/lib/kunit/Makefile
> +++ b/lib/kunit/Makefile
> @@ -18,9 +18,10 @@ obj-y += hooks.o
>
> obj-$(CONFIG_KUNIT_TEST) += kunit-test.o
>
> -# string-stream-test compiles built-in only.
> +# string-stream-test and log-test compiles built-in only.
> ifeq ($(CONFIG_KUNIT_TEST),y)
> -obj-$(CONFIG_KUNIT_TEST) += string-stream-test.o
> +obj-$(CONFIG_KUNIT_TEST) += string-stream-test.o \
> + log-test.o
> endif
>
> obj-$(CONFIG_KUNIT_EXAMPLE_TEST) += kunit-example-test.o
> diff --git a/lib/kunit/debugfs.c b/lib/kunit/debugfs.c
> index 22c5c496a68f..ab53a7e5c898 100644
> --- a/lib/kunit/debugfs.c
> +++ b/lib/kunit/debugfs.c
> @@ -37,14 +37,21 @@ void kunit_debugfs_init(void)
> debugfs_rootdir = debugfs_create_dir(KUNIT_DEBUGFS_ROOT, NULL);
> }
>
> -static void debugfs_print_result(struct seq_file *seq,
> - struct kunit_suite *suite,
> - struct kunit_case *test_case)
> +static void debugfs_print_result(struct seq_file *seq, struct string_stream *log)
> {
> - if (!test_case || !test_case->log)
> + struct string_stream_fragment *frag_container;
> +
> + if (!log)
> return;
>
> - seq_printf(seq, "%s", test_case->log);
> + /*
> + * Walk the fragments so we don't need to allocate a temporary
> + * buffer to hold the entire string.
> + */
> + spin_lock(&log->lock);
> + list_for_each_entry(frag_container, &log->fragments, node)
> + seq_printf(seq, "%s", frag_container->fragment);
> + spin_unlock(&log->lock);
> }
>
> /*
> @@ -69,10 +76,9 @@ static int debugfs_print_results(struct seq_file *seq, void *v)
> seq_printf(seq, KUNIT_SUBTEST_INDENT "1..%zd\n", kunit_suite_num_test_cases(suite));
>
> kunit_suite_for_each_test_case(suite, test_case)
> - debugfs_print_result(seq, suite, test_case);
> + debugfs_print_result(seq, test_case->log);
>
> - if (suite->log)
> - seq_printf(seq, "%s", suite->log);
> + debugfs_print_result(seq, suite->log);
>
> seq_printf(seq, "%s %d %s\n",
> kunit_status_to_ok_not_ok(success), 1, suite->name);
> @@ -105,9 +111,13 @@ void kunit_debugfs_create_suite(struct kunit_suite *suite)
> struct kunit_case *test_case;
>
> /* Allocate logs before creating debugfs representation. */
> - suite->log = kzalloc(KUNIT_LOG_SIZE, GFP_KERNEL);
> - kunit_suite_for_each_test_case(suite, test_case)
> - test_case->log = kzalloc(KUNIT_LOG_SIZE, GFP_KERNEL);
> + suite->log = raw_alloc_string_stream(GFP_KERNEL);
> + string_stream_set_append_newlines(suite->log, true);
> +
> + kunit_suite_for_each_test_case(suite, test_case) {
> + test_case->log = raw_alloc_string_stream(GFP_KERNEL);
> + string_stream_set_append_newlines(test_case->log, true);
> + }
>
> suite->debugfs = debugfs_create_dir(suite->name, debugfs_rootdir);
>
> @@ -121,7 +131,7 @@ void kunit_debugfs_destroy_suite(struct kunit_suite *suite)
> struct kunit_case *test_case;
>
> debugfs_remove_recursive(suite->debugfs);
> - kfree(suite->log);
> + raw_free_string_stream(suite->log);
> kunit_suite_for_each_test_case(suite, test_case)
> - kfree(test_case->log);
> + raw_free_string_stream(test_case->log);
> }
> diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
> index 83d8e90ca7a2..ecc39d5f7411 100644
> --- a/lib/kunit/kunit-test.c
> +++ b/lib/kunit/kunit-test.c
> @@ -530,55 +530,6 @@ static struct kunit_suite kunit_resource_test_suite = {
> .test_cases = kunit_resource_test_cases,
> };
>
> -static void kunit_log_test(struct kunit *test)
> -{
> - struct kunit_suite suite;
> -
> - suite.log = kunit_kzalloc(test, KUNIT_LOG_SIZE, GFP_KERNEL);
> - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, suite.log);
> -
> - kunit_log(KERN_INFO, test, "put this in log.");
> - kunit_log(KERN_INFO, test, "this too.");
> - kunit_log(KERN_INFO, &suite, "add to suite log.");
> - kunit_log(KERN_INFO, &suite, "along with this.");
> -
> -#ifdef CONFIG_KUNIT_DEBUGFS
> - KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
> - strstr(test->log, "put this in log."));
> - KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
> - strstr(test->log, "this too."));
> - KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
> - strstr(suite.log, "add to suite log."));
> - KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
> - strstr(suite.log, "along with this."));
> -#else
> - KUNIT_EXPECT_NULL(test, test->log);
> -#endif
> -}
> -
> -static void kunit_log_newline_test(struct kunit *test)
> -{
> - kunit_info(test, "Add newline\n");
> - if (test->log) {
> - KUNIT_ASSERT_NOT_NULL_MSG(test, strstr(test->log, "Add newline\n"),
> - "Missing log line, full log:\n%s", test->log);
> - KUNIT_EXPECT_NULL(test, strstr(test->log, "Add newline\n\n"));
> - } else {
> - kunit_skip(test, "only useful when debugfs is enabled");
> - }
> -}
> -
> -static struct kunit_case kunit_log_test_cases[] = {
> - KUNIT_CASE(kunit_log_test),
> - KUNIT_CASE(kunit_log_newline_test),
> - {}
> -};
> -
> -static struct kunit_suite kunit_log_test_suite = {
> - .name = "kunit-log-test",
> - .test_cases = kunit_log_test_cases,
> -};
> -
> static void kunit_status_set_failure_test(struct kunit *test)
> {
> struct kunit fake;
> @@ -658,7 +609,6 @@ static struct kunit_suite kunit_current_test_suite = {
> };
>
> kunit_test_suites(&kunit_try_catch_test_suite, &kunit_resource_test_suite,
> - &kunit_log_test_suite, &kunit_status_test_suite,
> - &kunit_current_test_suite);
> + &kunit_status_test_suite, &kunit_current_test_suite);
>
> MODULE_LICENSE("GPL v2");
> diff --git a/lib/kunit/log-test.c b/lib/kunit/log-test.c
> new file mode 100644
> index 000000000000..a93d87112fea
> --- /dev/null
> +++ b/lib/kunit/log-test.c
> @@ -0,0 +1,72 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * KUnit test for logging.
> + *
> + * Based on code:
> + * Copyright (C) 2019, Google LLC.
> + * Author: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
> + */
> +#include <kunit/test.h>
> +
> +#include "string-stream.h"
> +
> +static void kunit_log_test(struct kunit *test)
> +{
> + struct kunit_suite suite;
> + char *full_log;
> +
> + suite.log = alloc_string_stream(test, GFP_KERNEL);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, suite.log);
> + string_stream_set_append_newlines(suite.log, true);
> +
> + kunit_log(KERN_INFO, test, "put this in log.");
> + kunit_log(KERN_INFO, test, "this too.");
> + kunit_log(KERN_INFO, &suite, "add to suite log.");
> + kunit_log(KERN_INFO, &suite, "along with this.");
> +
> +#ifdef CONFIG_KUNIT_DEBUGFS
> + KUNIT_EXPECT_TRUE(test, test->log->append_newlines);
> +
> + full_log = string_stream_get_string(test, test->log, GFP_KERNEL);
> + KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
> + strstr(full_log, "put this in log."));
> + KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
> + strstr(full_log, "this too."));
> +
> + full_log = string_stream_get_string(test, suite.log, GFP_KERNEL);
> + KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
> + strstr(full_log, "add to suite log."));
> + KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
> + strstr(full_log, "along with this."));
> +#else
> + KUNIT_EXPECT_NULL(test, test->log);
> +#endif
> +}
> +
> +static void kunit_log_newline_test(struct kunit *test)
> +{
> + char *full_log;
> +
> + kunit_info(test, "Add newline\n");
> + if (test->log) {
> + full_log = string_stream_get_string(test, test->log, GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL_MSG(test, strstr(full_log, "Add newline\n"),
> + "Missing log line, full log:\n%s", full_log);
> + KUNIT_EXPECT_NULL(test, strstr(full_log, "Add newline\n\n"));
> + } else {
> + kunit_skip(test, "only useful when debugfs is enabled");
> + }
> +}
> +
> +static struct kunit_case kunit_log_test_cases[] = {
> + KUNIT_CASE(kunit_log_test),
> + KUNIT_CASE(kunit_log_newline_test),
> + {}
> +};
> +
> +static struct kunit_suite kunit_log_test_suite = {
> + .name = "kunit-log-test",
> + .test_cases = kunit_log_test_cases,
> +};
> +
> +kunit_test_suites(&kunit_log_test_suite);
> diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> index 4b69d12dfc96..14e889e80129 100644
> --- a/lib/kunit/test.c
> +++ b/lib/kunit/test.c
> @@ -109,51 +109,17 @@ static void kunit_print_test_stats(struct kunit *test,
> stats.total);
> }
>
> -/**
> - * kunit_log_newline() - Add newline to the end of log if one is not
> - * already present.
> - * @log: The log to add the newline to.
> - */
> -static void kunit_log_newline(char *log)
> -{
> - int log_len, len_left;
> -
> - log_len = strlen(log);
> - len_left = KUNIT_LOG_SIZE - log_len - 1;
> -
> - if (log_len > 0 && log[log_len - 1] != '\n')
> - strncat(log, "\n", len_left);
> -}
> -
> -/*
> - * Append formatted message to log, size of which is limited to
> - * KUNIT_LOG_SIZE bytes (including null terminating byte).
> - */
> -void kunit_log_append(char *log, const char *fmt, ...)
> +/* Append formatted message to log. */
> +void kunit_log_append(struct string_stream *log, const char *fmt, ...)
> {
> va_list args;
> - int len, log_len, len_left;
>
> if (!log)
> return;
>
> - log_len = strlen(log);
> - len_left = KUNIT_LOG_SIZE - log_len - 1;
> - if (len_left <= 0)
> - return;
> -
> - /* Evaluate length of line to add to log */
> va_start(args, fmt);
> - len = vsnprintf(NULL, 0, fmt, args) + 1;
> + string_stream_vadd(log, fmt, args);
> va_end(args);
> -
> - /* Print formatted line to the log */
> - va_start(args, fmt);
> - vsnprintf(log + log_len, min(len, len_left), fmt, args);
> - va_end(args);
> -
> - /* Add newline to end of log if not already present. */
> - kunit_log_newline(log);
> }
> EXPORT_SYMBOL_GPL(kunit_log_append);
>
> @@ -359,14 +325,14 @@ void __kunit_do_failed_assertion(struct kunit *test,
> }
> EXPORT_SYMBOL_GPL(__kunit_do_failed_assertion);
>
> -void kunit_init_test(struct kunit *test, const char *name, char *log)
> +void kunit_init_test(struct kunit *test, const char *name, struct string_stream *log)
> {
> spin_lock_init(&test->lock);
> INIT_LIST_HEAD(&test->resources);
> test->name = name;
> test->log = log;
> if (test->log)
> - test->log[0] = '\0';
> + string_stream_clear(log);
> test->status = KUNIT_SUCCESS;
> test->status_comment[0] = '\0';
> }
> --
> 2.30.2
>

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